Can you check that you're running an 88t spur in your XX4. What colour is it?? It's just that the chassis should be to close to run an 88t
Anyway.....
XX4 - LRP X11 5.5t - 84/16
XXX-CR - LRP 6.5t - 84/18
I'd say at the most on a 4.5t burshless in a XX4 - 84/15
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